✨: add HasArrayRFloorDiv protocol

Support right floor division operator for array classes

Author: nstarman

src/array_api_typing/_array.py

@@ -290,6 +290,22 @@ def __ifloordiv__(self, other: Self | int | float, /) -> Self:
         ...
 
 
+class CanArrayRFloorDiv(Protocol):
+    """Protocol for array classes that support the right floor division operator."""
+
+    def __rfloordiv__(self, other: Self | int | float, /) -> Self:
+        """Calculates the quotient for each element of an array instance with the respective element of the array other.
+
+        Args:
+            other: divisor array. Must be compatible with self (see Broadcasting). Should have a numeric data type.
+
+        Returns:
+            an array containing the element-wise quotients. The returned array must have a data type determined by Type Promotion Rules.
+
+        """  # noqa: E501
+        ...
+
+
 class CanArrayMod(Protocol):
     """Protocol for array classes that support the modulo operator."""
 
@@ -371,6 +387,7 @@ class Array(
     CanArrayRTrueDiv,
     CanArrayFloorDiv,
     CanArrayIFloorDiv,
+    CanArrayRFloorDiv,
     CanArrayMod,
     CanArrayIMod,
     CanArrayPow,